By Katz, Joseph
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Extra info for Automotive aerodynamics
11. A 1 m3 balloon is filled with helium at an ambient temperature of 30 C. 0 atm. The molecular weight of helium is about 4 and the surrounding air is about 29. Calculate the weight of the helium inside the balloon. What is the weight of outside air that has the same volume as the balloon? What is the meaning of this weight difference? 12. Usually, we check the tire pressure in our car early morning when the temperature is cold. 1013 105 N/m2). a. What is the tire pressure when the car is left in the summer sunshine and the tire temperature reaches 333 K?
Calculate this ratio for the small bird of the previous problem flying at a speed of 14 m/s. 8 10–8 m). 29. 5 m long, and 10 kg block (m1) slides on a 1 mm thin oil film, pulled by the mass m2, as shown. 29 N s/m2). 30. 29, but now m1 = 20 kg. 31. The disk shown in the figure rotates at a speed of 50 RPM above a stationary plane separated by an oil film. 01 kg/(m/s), the spacing between the disc and the stationary surface is 2 mm, and R = 5 cm, calculate the torque required to rotate the disk (assume linear velocity distribution in the gap).
34 109 N/m2. 1 Introduction One approach in teaching introductory aero/fluid mechanics is to avoid the presentation of the complex fluid dynamic equations. This is done for very good reasons, including the lack of preparation in partial differential equations and due to the overall complexity of the problem. Although avoiding the introduction of the complex equations is welcomed by the average students, the negative and long-term outcome of this approach is that there is no clear rationale and connecting string between the various chapters that will follow.
Automotive aerodynamics by Katz, Joseph